Sewing machine



R. BECKER SEWING MACHINE May 9, 1933.

Filed Oct. 28, 1931 5 Sheets-Sheet l gwwntoa; Rudolph Beker May 9, 1933. R. BECKER SEWING MACHINE Filed 001'.. 28, 1931 5 Sheets-Sheet 2 l y gwvwvtoe Rudolph B e cker May 9, 1933. R. BECKER 1,908,280

SEWING MACHINE Filed oct. 28, 1931 5 sheets-sheet 5 gwumkoz Rudolph Becher Patented May 9, 1933 Unirse STATES PATENT oFF-lcs RUDOLPH BECKER, 0F NORTH PLAINFIELD, NEW JERSEY, ASSIG'NOR` TO THE SINGER MANUFACTURING COMPANY, OF ELIZABETH, NEW'JERSEY, A CORPOBATTON' 0F NEW JERSEY SEWING MACHINE;

Application led October 28, 1931. Serial VNo. 571,557.

This invention relates to sewing machines of the type having laterally vibrating stitchforming mechanism adapted for the formation of zigzag stitches and has for one of its objects to provide improved means for vibrating the loop-taker in unison with the needle in such a manner as to maintain a fixed working relation between the loop-taker and the needle at all times. l

Another object of this invention is to providemore room under the gooseneck of the machine so that there will be ample space for the accommodation of the work.

Another object of this invention is to'provide an improved coupling between the looptaker actuating shaft and the loop-taker.

Vith the above and other objects in view, as will hereinafter appear, the invention consists in the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

in the accompanying drawings:

'Figure 1 is a side elevation, partly in section, of the machine embodying the invention.

Figure 2 is a top plan view, partly'in section, of the overhanging arm.

Figure 3 is a front end elevation of the machine.

Figure 4 is a rear side elevation-of the head of the machine.

`Figure 5 is a section'taken along the line 5-5 of Figure l. y

And Figure 6 is a section taken along the line 6--6 of Figure 5.

In the embodiment of this invention selected for illustration, the machine is formed with a frame having a bed 1, an upright member or standard 2 and overhanging arm 3 terminating in the head 4.

Pivo-tally mounted on a stud 5 fixed to the head 4 is an oscillatory needle-bar-carrier 6 having upper and lower bearings, 7 .and 8, respectively, in which the reciprocating needle-bar 9 carrying the needle 10 is j ournaled.

The headV of the overhanging arm'is prop vided with bosses 19 apertured to receive the presser-bar 20,' the latter carrying the presserfoot 21 and being provided with la clamparm 22 havingv an inclined upward extension22 which receives the pressure of flat spring 23, the latter acting to lower the presser-foot upon the material when' the presser-bar'is released by the usual lifting lever24. Y

Carried by the head of the machine isy an automatic presser-footflifter comprising a short shaft 25 extending through anV aperture inthe head 4 of the machinev and adapted to be moved axially therein. Fixed to one end of thefshaft 25 isa lever 27, actuated by a pinl 34 secured to the levervj14; and iixed to the other end of the shaft 25 is a lever 26 offset' so that its end'26 extends -under Vthe Vclamp-arm 22'which isprovided with an adjustment screw 32 ,engaged by said end 26. Secured tothe guide-post 28jby means of a set-screw 29 is a block 30 :having a springpressed plunger 31 which is forced down by the rounded edge 33 of the lever end 26f when the automatic presser-foot lifter Vis 'shifted from linactive to active position. When the operator wishes to use the automatic presserfoot lifter, pressure is applied to the hubv looper-carrier block 40 slidably held between the plates 41 and 42 fixed to the bed of the machine. Secured at one end in a. guideway in the looper-carrierby the screw 43 (see Fig. is a needle-throat member 44 formed at'its free'end with a needle-aperture 45.

kSecured to the end of the looper-shaft 39 is a member 46 bifurcated to form two extendingprongs 47 and to the usual main-shaft 18 a similar and complementary member 48 having-two extending prongs 49 is secured.

Y Carried by the prongs 47 and 49 is a circular memberi) of bakelized fabric provided with four rectangular channels on its outer periphery which l receive `the prongs. It will be observed in Figure 6 that the depth Y.of the channels'` is greater than theV depth of the prongs', This construction constitutes a universal coupling, and also permits the loopercarrierk to be moved vin the direction of its length without disturbing the driving relaiii Ashaft 18.

tion between the main-shaft and looper-shaft. Fixed to the needle-bar carrier 6 by the screws 51Y is a curved arm 52 enclosed in the overhanging arm 3 and standard 2. Y The arm 52 is enlarged at its lower end and is provided Vwith'-'anfelongated slot53.' Fixed to the enlarged vlowerend of the'arm 52 by means of `screws 54 is a bracket 55 to which issecured bythe' screw56 one `end of a second arm 57, the other end of Vwhich is fixed to the loopercarrier by the screws 5,8. It will be observed that thearms 52, and 57 constitute, in effect, a single rigid horizontal lil-shaped member having one limb pivoted on the stud. 5 and the other limb fixed to thelooper-carrier 40.

@Fixed to' the main-shaft 18 by the set-screw 59 is a pinion 59 meshing with the geartoothed portion 6() of a barrel-cam 61 mounted to'freely rotate on the Ashort-shaft 61. The ratio-ofY gearing between the lpinion 59 and the gear 60 is as one is to two; the cam 61 rotating at one-half the speedof the main- The cam 61 is provided with a cam-race 62 intowhich a cam-follower 63 mounted on one,V end of the lever `64 extends.V

The other end of the lever 64 is fixed to the shaft .65 which-is journaled in and extends through the boss 66 made integralwith the base l. Fixed tothe end of the shaft 65 extending through and protruding from the boss 66 is a lever 67 having an elongated slot 68.V Adjustably secured in the elongated slot 53of the member 52 is a block 69 and a stud-bolt 70 the end of which extends into the slot 68 of the lever 67 where it is received by the square nut 7l slidable in the slot 68. A washer 7 2 is provided to separate the member 52 from the lever 67. This assembly permits the side-throw of the needle-bar carrier and looper-ca-rrier to be varied.

The cam-race 62 is soshaped as to vibrate the needle and looper laterally of the line of feed and hold them in theirextreme positions while the needle is penetrating the work and presenting its loop to the looptaker; the late-ral shift being effected while the needle is out of the work.

To further support the looper-carrier so that it will move in the arc of a circle about the pivot 5, a channel 73 is provided in the side of the looper-carrier 40. The channel 73 is in the form of the arc of a circle; the radius being the distance between the center of the pivot 5 and the center of the channel. Carried by the plate 41 is a stud 74 with its end extending into the channel 73. The pin and channel together, forma supplemental support which insures the correct travel of the looper-carrier. lt is not essential that the looper-ca-rrier 40 be rigidly connected to the needle-bar carrier 6 so long as the loopercarrier 40 is mounted for movement about the axis of the needle-bar carrier supporting stud 5 as a center. Ttwillbe obvious that any other equivalent form of mechanism may be substituted for the stud and slot connection 73 and 74.

The advantageA of having the needle-,bar carrier and looper-carrier swingable about a common axis is that the needle and looper maintain the same position relative to each .other irrespective ofthe position to which the same point on the needle during each stitch-forming operation. It will also be observed that a plane containing the axis of the needle and a plane passed through the beak of the looper at right angles to the looper-shaft are always parallel. This facilitates seizing and spreading of the loop, thus, increasing the speed at which the machine may be operated.

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improvedsewing machinewill be clearly `and fully understood. It is apparent that such a device has a` wi de variety of uses, and it will be understood that the form, constructionv and arrangement of the several elements employed may be varied. Therefora the privilege is reserved of resorting tovall such legitimate changes thereinvas Vmay be fairly embodied within the spirit andscope of the appended claims.

to said looper-carrier, and means for vibrat-v v ing said member.

2. In a sewing machine the combim tion of a horizontal pivot, a needle-bar carrier pivoted at its upper end to said'pivot, a loopercarrier, and means for concomitantly swinging said needle-bar carrier and said loopercarrier about said pivot.

3. In a sewing machine the combination ofV feeding mechanism, a pivoted needle-bar carrier, a movable looper-carrier, a horizont-al U-shaped member having one of its limbs fixed to said needle-bar carrier and the other of its limbs fixed to said looper-carrier, and means for vibrating said member laterally of the line of feed.

4. In a sewing machine the combination of a pivoted needle-bar carrier, a pivoted loopercarrier, a looper having operative movements about an axis in said looper-carrier, and means for swinging said needle-bar carrier about its pivot and for swinging said loopercarrier about the same pivot in a direction longitudinally of said axis.

5. In a sewing` machine the combination of a fixed horizontal pivot, a needle-bar carrier and a looper-carrier swingably mounted on said pivot, and means for vibrating said needle-bar carrier and said looper-carrier in a vertical plane transverse to said pivot.

6. In a sewing machine the combination of a pivot, a needle-bar carrier and loopercarrier mounted to vibrate in a vertical plane about said pivot, andv means for vibrating said needle-bar carrier and said looper-carrier about said pivot.

7. In a sewing machine the combination of a. pivot, a needle-bar carrier pivoted thereto, a reciprocating needle journaled in said needle-bar carrier, a looper-carrier pivoted to and adapted to swing about said pivot, a looper having a shaft journaled in said looper-carrier, and means for swinging said needle-bar carrier and said looper-carrier in unison about said pivot and lengthwise of the looper-shaft.

8. A sewing machine having in combination, a needle-bar carrier swingable about a horizontal pivot, a looper-carrier also swingable about said pivot, a rigid member having one end fixed to said needle-bar carrier and the other end fixed to said loopercarrier, and means for vibrating said member in a vertical plane about said horizontal pivot. Y

9. A sewing machine having in combination, a1oopershaft,a main-shaft for'actuating said looper-shaft, means for moving said looper'ishaft longitudinallyof Vitself in the arc'of a circle, and an lextensible anduniversal coupling connecting said.,v main-shaft to said"looper-shaft.:` v

10. Asewing machine having in combination ya horizontal pivot fixed to the head of the machine, a needle-bar carrier swingable about said pivot, a Vrigid memberl having its upper-end fixed to said needle-bar carrier, a looper-carrier fixed'to'the lower end ofsaid rigid member, andmeans for vibrating said vmemben Il. In a sewingmachine, in combination, a horizontal`pivot,a needle-bar carrier swingably mounted on said pivot, a reciprocating needle journaled in said needle-bar carrier, a looper-carrier movable about said pivot, a looper-shaft journaled in said looper-carricr, feeding mechanism for feeding the work l l2. In a sewing machine, Vin combination,

a horizontal pivot fixed to the head of the machine, a needle-bar 'carrier swingably mounted on said pivot, a member bowed between its ends away from the line of feed and having one end fixed to said needle-bar carrier, a looper-carrier fixed to the other end of said member, and means for vibrating said member.

13. In a sewing machine, in combination, a pivot, a needle-bar carrier mounted on said pivot, alooper-carrier also mounted on said pivot, a looper-shaft journaled in said looper-carrier, a main-shaft actuating said looper-shaft, feeding mechanism for feeding the work transverse to said looper-shaft and said main-shaft, and automatic means for swinging said looper-carrier andV said needie-bar carrier about said pivot. p

14. A sewing machine having, a bed-plate, a standard and anoverhanging arm, in combination with, a pivot, a needle-bar carrierl swingably mounted thereon, a swingable looper-carrier, a member connected to said needle-bar carrier and said looper-carrier and enclosed in said arm and standard and disposed in part below said bed-plate, and automatic means for vibrating said member.

15. In a sewing machine, in combination, a horizontal pivot located above the throatplate of the machine, Va needle-bar carrier mounted to swing on said pivot, a loopercarrier mounted to move longitudinally of itself in the arc of a circle about said pivot, a'looper-shaft journaled in said loopercarrier and movable therewith, a driving shaft mounted in fixed bearings and adapted to actuate said looper-shaft, and means under control of said driving shaft for vibrating vsaiol needle-barY carrier and said looper-carier about said pivot.v

16. In a sewing machine, in combination,

a horizontal pivot, a needle-bar Carrier 5 swingably mounted on said pivot, a reciprooat-ing needle-bar carrying a needle jour naled in said needle-bar carrier,4 a loop-taker cooperating with said needle in the formation of stitches, and means for c0ncomtant- V"'19 1y joggingsaid neeolle'y and loop-taker in a vertical plane, said last named means including means orl causing said loop-taker to move in the are of a circle about said pvot. In testimony whereof I have signed my 15 name to this specification.

Y RUDOLPH BECKER.

'GoAV 

